Riveting tool



Aug. 5, 1941. 4 E, BECKER ETAL 2,251,389

RIVETING TOOL Filed Nov. 14, 1958 *.By n' A TroR/VEY Patented Aug. 5, 1941 TENT orifice RIVETING TOL Emil Becker, Munich, Germany, and John Edward Becker, Stoney Creek, Ontario, Canada Application November 14, 1938, Serial No. 240,326 1n Germany April 14, A1938 4 (Cl. 'lbf-51) 3 Claims.

This invention relates to improvements in riveting anvils or backing tools suchas are used in setting or heading rivets, and the object of the invention is to provide a tool which is particularly adapted for use in the riveting of relatively small cell-like or hollow structures which are so dimensioned as not to permit manual backing or riveting inside the structure. In carrying out the invention we furnish a riveting tool having suiiicient mass to withstand riveting blows, said movable mass being retained against the shank end of a rivet under the force of gravity on its mass and under the force of gravity following the shortening of the rivet during the riveting process.

Another object of the invention is to furnish a riveting tool which comprises a metal block rockable about a fulcrum point and wherein the rockable mass of metal on one side of the fulcrum is greater than the roclrable mass of metal on the other side of the fulcrum, so that one end of the block is normally directed up-wardly and constitutes the anvil against which the rivet rests.

A further object of our invention is to provide the riveting block with means for adjusting the position of the fulcrum and also in certain instances to mount the riveting block upon the movable carriage on which the block is fulcrumed.

The underlying principle of our invention is to l riveting process, the anvil follows the shortening of the rivet under the force of gravity.

'I'he riveting tool is primarily designed for use in riveting together light-gauge metal sheets, particularly in the formation oi cellular structures,

and while the tool may be designed for heavier riveting work, it is to be understood that the rivets `are generally of small diameter, that is, in the vicinity oi' one-eighth to one-sixteenth oi an inch. It is also to be understood that the riveting of each rivet takes only a small fraction of time measurable in seconds, and is preferably performed with a rapidly vibrating hammer device.

The manner in which the riveting block is constructed is set forth in the following description and shown in the accompanying drawing which illustrates several modiiications of the underlying principle of our invention.

Figure 1 shows an anvil pivotally mounted on a carriage and actuated by a weighted mass.

Figure 2 is similar to the construction shown in Figure l but incorporates means for pressing the parts to be riveted together during riveting;

Figure 3 shows a tiltable work table.

In Figure 1 the riveting tool is shown as mounted on a carriage 41 which is provided with wheels 23. The riveting tool is formed with a transverse horizontal slot 39 containing a pin 50 carried by the carriage 41 and upon which the tool tilts. By sliding the tool so that the position of the pin 50 in the slot 30 is changed, the upward thrust of the vanvil end of the tool can be altered. The slot 3l in the weighted mass 2 is provided so that the tool may be turned over to rivet from below, placing the anvil in the position shown by the dotted lines. The member 32 is adjustable and engages the weighted mass 2, limiting the depth to which the rivet 5 may be inserted. The plate 33 which is mounted on the anvil portion is adjustable and checks the height of the nished rivet head. The arm 34 which carries the wheel 36a is adjustable as to pitch and height and prevents the operator from driving the head too thin. Different heights of carriages may be kept in store to rivet structures of various heights.

In Figure 2 is illustrated a modification of Figure 1 which incorporates the additional feature of a device for pressing the parts to be riveted together during riveting, thus obtaining a particularly strong seam or joint. The riveting tool is pivotally mounted on the member 31 which is provided with a weighted mass 38. The member 31 is mounted pivotally on the carriage 41 by the pin 35. The member 31 also carries a wheel 3a which presses against the work from the inside. Pressing against the outside of the work is a ring 33 which is associated with the riveting hammer. Only after a certain predetermined pressure is exerted on the ring 39 will the lever 4i? release the air valve of the riveting hammer. The set-screw lil carried by the member 31, in conjunction with the pin I9, adjusts the anvil I to the correct riveting position.

In Figure 3 is shown a work table suitable for riveting. It consists of `a tiltable bench 44 which is pivotally mounted on the tripod i5 by means of the shaft 46. The tripod 45 is adjustable as to height so that the tiltable bench 44 may be raised or lowered as desired. By tilting the bench it may be brought to the proper angle to obtain the most eiiective action of gravity on the anvil.

While in Figures 3 and 1 of our drawing we have shown a swingable block which constitutes the riveting tool as tiltable upon a pin passing through the block, and wherein the pin is supported by a suitable carriage, it will be appreciated that the tiltable blocks as shown in these two gures could be fulcrumed upon fulcrum points formed in the bottoms of the blocks as illustrated in the construction shown in the other Iigures of our drawing. In such case the fulcrum points on the bottom of the blocks would rest upon the carriages, and therefore While We have shown certain embodiments of our invention, it is to be understood that We can make such changes and alterations as may be deemed necessary Without departing from the spirit of our invention as set forth in the appended claims.

What We claim as our invention is:

1. A riveting tool comprising an anvil portion, a Weighted mass acting on the anvil, a fulcrum upon which the anvil and Weighted mass rock, a movable carriage upon which the fulcrum is mounted, an adjustable distance piece carried by the anvil portion to predetermine the height of the rivet head, and an adjustable stop carried by the anvil to regulate the depth to which a rivet may be inserted.

2. A riveting tool comprising an anvil portion, a Weighted mass acting on the anvil, a fulcrum upon which the anvil and Weighted mass rock, a movable carriage upon Which the fulcrum is mounted, and a second Weighted mass pivotally carried by said carriage adapted to press against a joint at the point of riveting.

3. A riveting tool comprising an anvil portion, a Weighted mass acting on the anvil, a fulcrurn upon which the anvil and weighted mass rock, a movable carriage upon which the fulcrum is mounted, an adjustable distance piece carried by the anvil portion to predetermine the height of the rivet head, an adjustable stop carried by the anvil to regulate the depth to Which a rivet may be inserted, and a second weighted mass pivotally carried by said carriage adapted to press against a joint at the point of riveting.

EMIL BECKER. JOHN EDWARD BECKER. 

